Monday, February 11, 2013

Apache configuration(IN SERVERS USER WHM TO ADD GLOBAL SETTING TO THE httpd.conf)

Apache configuration(IN SERVERS USER WHM TO ADD GLOBAL SETTING TO THE httpd.conf)

To start, open the Apache configuration file and finding the directives section. On a cPanel server, it will be located in /usr/local/apache/conf/. On a Plesk server, it will be in /etc/httpd/conf/. If you are using vi or vim: once you open the file, you can find the directives by scrolling through the file, or by typing forward-slash ‘/’ and typing the exact string that you are looking for (search is case specific).
[root@host /] vim /usr/local/apache/conf/httpd.conf
or
[root@host /] vim /etc/httpd/conf/httpd.conf
This list is a composite of the settings we will be reviewing from fresh install on a cPanel server:

Timeout 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15
MinSpareServers 5
MaxSpareServers 10
StartServers 5
MaxClients 150
MaxRequestsPerChild 0

Timeout 300
Usually this value doesn’t require editing and a default of 300 is sufficient. Lowering the ‘Timeout’ value will cause a long running script to terminate earlier than expected.
On virtualized servers like VPS servers, lowering this value to 100 can help improve performance.
KeepAlive On
This setting should be “On” unless the server is getting requests from hundreds of IPs at once.
High volume and/or load balanced servers should have this setting disabled (Off) to increase connection throughput.
MaxKeepAliveRequests 100
This setting limits the number of requests allowed per persistent connection when KeepAlive is on. If it is set to 0, unlimited requests will be allowed.
It is recommended to keep this value at 100 for virtualized accounts like VPS accounts. On dedicated servers it is recommended that this value be modified to 150.
KeepAliveTimeout 15
The number of seconds Apache will wait for another request before closing the connection. Setting this to a high value may cause performance problems in heavily loaded servers. The higher the timeout, the more server processes will be kept occupied waiting on connections with idle clients.
It is recommended that this value be lowered to 5 on all servers.
MinSpareServers 5
This directive sets the desired minimum number of idle child server processes. An idle process is one which is not handling a request. If there are fewer spareservers idle then specified by this value, then the parent process creates new children at a maximum rate of 1 per second. Setting this parameter to a large number is almost always a bad idea.
Liquidweb recommends adjusting the value for this setting to the following:
Virtualized server, ie VPS 5
Dedicated server with 1-2GB RAM 10
Dedicated server with 2-4GB RAM 20
Dedicated server with 4+ GB RAM 25
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WHM Tweaking – Tweak WHM for better security and performance.

Server Setup =>> Tweak Settings
Check the following items...
Under Domains: Prevent users from parking/adding on common internet domains. (ie hotmail.com, aol.com)
Under Mail: Attempt to prevent pop3 connection floods
Default catch-all/default address behavior for new accounts - blackhole
Under System: Use jailshell as the default shell for all new accounts and
modified accounts

Goto Server Setup =>> Tweak Security
Enable php open_basedir Protection

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PHP Tightening – Tweak PHP by changing the parameters of php configuration for better security and performance.
php.ini & disabled functions
Edit php.ini

[root@server ]# nano /usr/local/lib/php.ini
safe_mode = On
allow_url_fopen = off
expose_php = Off
Enable_dl= Off
magic_quotes = On
register_globals = off
display errors = off
disable_functions = system, show_source, symlink, exec, dl,shell_exec, passthru, phpinfo, escapeshellarg,escapeshellcmd, popen, proc_open, allow_url_fopen, ini_set
************************************************************
PHP Upgarde – Compile PHP to its latest stable version which increases server security.

Using easyapache script .
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MySQL optimization – Optimize MySQL value for better performance and stability
/usr/local/cpanel/3rdparty/mysqltuner/mysqltuner.pl

#DO NOT MODIFY THE FOLLOWING COMMENTED LINES!
[mysqld]
max_connections = 400
key_buffer = 16M
myisam_sort_buffer_size = 32M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 1024
thread_cache_size = 286
interactive_timeout = 25
wait_timeout = 1000
connect_timeout = 10
max_allowed_packet = 16M
max_connect_errors = 10
query_cache_limit = 1M
query_cache_size = 16M
query_cache_type = 1
tmp_table_size = 16M
skip-innodb

[mysqld_safe]
open_files_limit = 8192

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer = 32M
sort_buffer = 32M
read_buffer = 16M
write_buffer = 16M

MySQL parameters like query_cache_size, key_buffer_size, Table_cache, sort_buffer, read_rnd_buffer_size, thread_cache, tmp_table_size, query_cache_size etc should be altered according to your server status.

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